Well, we called it. Dave Perry, Gaikai's CEO, delivered a brief presentation during Sony's Playstation Meeting detailing how the 'Playstation Cloud' will evolve over time to deliver backwards-compatibility to the PS4 and streamed, full-game demos for would-be purchasers.

Perry's dream, as he put it in the presentation, is that this service might be able to stream "everything ever," however no specific games were revealed.

Perry also announced that Sony's goal is to provide all PS4 owners with the gift of "free exploration", meaning that the Gaikai will be used to power a try-before-you-buy service for PS4 software that will allow players to explore a portion of the full game (rather than a scripted demo) before they put down any money.

"By combining PlayStation Network with Gaikai Inc’s cloud technology, it is SCE’s goal to make free exploration possible for various games," Sony said in a statement following the event. "In the future, when a gamer sees a title of interest in PlayStation Store, they can immediately start playing a portion of the actual game — not a stripped down version of the game.

"With Gaikai and PlayStation Store, gamers will be able to experience appealing games and only pay for the games they actually love. PlayStation Network and the cloud will offer additional value to PlayStation gamers. SCE is exploring unique opportunities enabled by cloud technology with the long-term vision of making PlayStation libraries including an incredible catalog of more than 3000 PS3 titles that is unmatched in the industry, mostly ubiquitous on PS4."

Being able to play "everything ever" would be lovely, but I have no doubts that Sony would price things so high that it'd defeat the point. For example, I'd say all PSX and PS2 games max at £5, and PS3 games max at £10, but it won't happen.

You are forgetting the big thing they hinted on earlier when they were talking about Streaming onto various devices such as the Vita, mobile phones,tablets and the PC. My big speculation is that at some point early on the PS4 will be a Steambox.

@Quietus: I wouldn't be too sure about that. Fixed pricing is only one option, and the success of Playstation Plus might mean that backwards compatibility comes in the form of a paid subscription too, which could be very tempting. The entire history of Playstation for £40-50 a year on any device? I'd definitely be in.

But there are also a lot of people who don't like subscriptions. Would it be fair to pay the same amount for a year if you'd only ever want to play two games? And where do you draw the line on ownership? What happens when the console reaches the end of its life? Would your subscription just end, and you never get to play them again? Since you never 'own' anything, you could potentially be paying money to nothing long-term.